Thread: frustrated c noob

I am an experienced programmer using pascal with borlands delphi IDE and have recently took it upon myself to start to learn C. I have so far been able to figure out how to do things using google and some books. I am however at a loss for the following.

In delphi I could easily create a custom class using the class keyword and despite seaching for custom class and object related tutorials and exmpales on the internet I still have no idea how to wite a custom class. The following is a small test example I am trying to get working:

Code:

#include <stdio.h>

class MyClass
{
public:
   MyClass(int num)
   {
      setNum(num);
   }

   void setNum(int num)
   {
      number = num;
   }

   int getNum()
   {
      return number;
   }
private:
   int number;
};

main()
{
        int a;
        MyClass myc1(3);

        a = myc1.getNum();

        printf("the number is %d\n", a);

}

when I try to compile it using gcc I get:

tmp.c:4: parse error before "MyClass"
tmp.c:4: warning: data definition has no type or storage class
tmp.c:6: parse error before "MyClass"
tmp.c:7: syntax error before '{' token
tmp.c: In function `setNum':
tmp.c:16: `number' undeclared (first use in this function)
tmp.c:16: (Each undeclared identifier is reported only once
tmp.c:16: for each function it appears in.)
tmp.c: In function `getNum':
tmp.c:21: `number' undeclared (first use in this function)
tmp.c: At top level:
tmp.c:23: parse error before ':' token
tmp.c: In function `main':
tmp.c:30: parse error before "myc1"
tmp.c:32: `myc1' undeclared (first use in this function)

I guess this may be a trivial thing for most c programmers but any help would be greatly appreciated and more importantly lower my blood pressure. . Thanks

Originally Posted by QuantumPete

You're trying to write C++! C doesn't have classes. The closest would be a struct.

Even so, a struct doesn't contain functions. (Pointer to functions at best, but that's for another day).
Anyway, this code is valid, if you use C++. Rename your file .cpp and feed it to gcc (or g++, more accurately). You might want to give a return type to your main function though, preferably int.

Thanks guys will do. Thats quite interesting to find out.